Electric-alarm water-gage.



G.' p. lszn'aLRsH, -BLBCTBIC ALARM WATER GAGE. A KP-PLICATON FILED APR. 8, 1908.

9, w W/ LU in /w 1 1 d. Il Il l 1 o 1 9 w. W Mw w J G. C. MARSH. BLBGTRIG' ALARM 'WATER GAGE. APPLMATION FILED APR. 8, 1903.

Patented Feb.' 16, 14909.

2 SHEETS-SHEET 2 TES PACSENT OFFE.

GEORGE C. MARSH, OF DENVER, COLORADO, ASSGNORY OF ONE-HALF TO HENRY W. HART, OF DENVER, COLORADO.

mancante-ALARM waren-Geen.

Specication of Letters atent.

Patented Feb.' is, 190e.

Application led April 8, 1988. Serial No. 425,930.

To all whom it may concern:

Be it known that I, GEORGE C. MARSH, a citizen of therllnited States, residing in the city and county or' Denver and State of Colorado, have invented certain new and useful improvements in Electric-Alarm Watertiages; and l do Ydeclare the following to be a full, clear, and exact description of the invention, such as will enable others skilled inthe art to which it appertains to make and use the same, reference being'had to the accompanying drawings, and, to ythe figures ot' reference marked thereon, which form a part of this specification.

lvy invention relates to improvementsin water gages, my object being" to provide an attachment for water gages whereby an alarm mayl he 'given whenever the water reachesa predetermined level in either direction.

ln my improved construction provision is made for placing a tioat composed of material forming a good conductor for the electrical current, within the glass tube of the gage and equipping the latter with electrodes at both extremities'within which the ioat is adapted to come in contact whereby the i'ioat bridges the space between the electrodes and closes an electric circuit in which an alarm tevice or devices are located. As illustrated in the drawing` provision is made for ringing a bell and lighting an incandescent lainp whenever the circuit is closed by the action of the float. Vl'Thenever-this alarm is sounded, it will be known that the water has reached a high or low level within the boiler or other receptacle with which the gage may be connected. A device of this class is particularly advantageous by reason of the fact that it is adapted to notify any one in the vicinity of a boiler, that the water is low therein and needs replenishing.

Having briefly outlined my improved construction l will proceed to describe the same in detail reference being made to the accompanying drawing in' which is illustrated an embodiment thereof.

in this drawing, Figure l is a front View o'ta water gage equipped with my improvements. Fig. 2 is a side elevation of the same partly in section, without showing the alarm devices. Fig. .3 is a longitudinal section with which the water gage The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate the upper metallic litting and 6 the lower fitting with which the opposite extremities of the glass tube 7 of the water gage areconnected. In each case the tube extremity enters a stuffing box 8 whereby a water tight `ioint is formed. .lhe fittings 5 and 6 constitute casings in which are formed chambers 9 and l respectively, the said chambers being in communication with the opposite extremities of the tube 7 and also in communication with the boiler or other water receptacle to which the water gage is attached. The water gage may of course be connected with the boiler in any suitable manner whereby the opposite extremities otl the tube are brought into communication therewith. The fittings and G are provided with threaded openingsinto each oit' which is screwed a metallic casing 12 which as shown in the drawing is larger at its outerV extremity and tapers toward its opposite extremity. Within the casin 12 is located a bushing 13 composed of ard rubber or other suitable insulating material within which are embedded tw electrodes 14 which are insulated from each other. The inner extremities 15 of these electrodes are preferably composed of platinum though they may be fo lmed of any suitable conducting' material through which the circuit may be closed when the space between these extremities is bridged by a oat etwhich may be hollow and composed of aluminum since it is desirable to make it sutlicientlyY buoyant to float whereby it will rise and fall as the water ltluctuates in the tube according to the rise and fall within the boiler or other receptacle is connected. The outer extremities of the electrodes let are respectively attached to metal contacts 16 to which the outenextremity of the insnlat fittings are exteriorly provided. The con- Vconductors 1'( and ductors 17 and 18 leave the insulating tube at the upper extremity of the gage, the conduetor 17 leading to a pole 24 of anvelectric source 25, while the conductor 18 leads to an electric lamp 26. From this lamp a conductor 27 leads to van electric bell 28 from which a conductor 29 leads to the other pole 30 of the electric source. The conductors 19 and 20 are respectively connected with the 1S, whereby the electric circuit is closed through the lamp and the bell whenever the electrodes at either extremity ot' the gage are engagedv by the float f1.

From the foregoing description the use of my improved electric alarm water gage will be readily understood. Assuming that the gage. is connected w.th the boiler or other Water-containing receptacle in such a manner that the depth of water therein may be indicated by the rise `and fall of the water in the tube 7, .it will be clear that when 'the lwater falls sufficiently to allow the ioat to engage the extremities 15 of the lower pair ot electrodes 111, the electric circuit will be closed through both the incandescent lamp 26 and the alarm bell 28 thus giving both an audible and a visual alarm. Again when the water is high in the boiler and the rise in the tube is sullicient to cause the float to come in contact with the extremities 15 of the upper pair ci' electrodes, the circuit will be floscd and both signals given in the same manner as `when the tioat falls within the tute as heretofore explained.

.lt may be. stated that the float 4 in addition to its function ot closing-the circuit or bridging the space between the electrodes, hasl still another function, namely that of an indicator sinceits position in the glass tube is acadily ob crrablc whereby the water level within the boiler, tank or other receptacle may be known. ll desired this float may be colored for the purpose of making it more conspicuous.

Having thus described my invention, what I claim is:

1. The combination with a water gage, of a metallic casing threaded into an extremity of the gage, said casing being provided with an insulating bushing, separated electrodes embedded in the said bushing and whose inner extremities protrude into the tube, a float located within the tube and adapted to electrically bridge the space between the electrodes as the water reaches a predetermined level'within the tube, a circuit in which the electrodes are located, and an alarm device located within the circuit, substantially as described.

' 2. rhe combination with a water gage, of metallic casings threaded into the opposite extremities of the gage, each casing being rovided with an insulating bushing, separated electrodes embedded in the said bushing, arid whose inner extremities protrude into the tube, 4a fl'oat located within thc'tube and adapted to electrically bridge the space vbetween either pair of electrodes as the water reaches predetermined levels within the tube,

a circuit in which both pairs of electrodes are located, a'nd an alarm device or devices located within the circuit, substantially as described.

3. The combination with a water gage, of metallic casinffs inserted in the opposite extremities. of the gage, a pair of electrodes located within each casing, means for insulating the electrodes from each other, the inner extremities of each pair of electrodes being exposed to the water within the tube, two contacts with which the outer extremities of each pair of electrodes are respectively connected, an electric circuit in which the said contacts are located., an alarm device or devices located within the circuit, and a` tloat located within the water tube and composed of conducting material, the said float' being adapted to electrically bridge the space between either pair of electrodes and close the circuit as the water rises and falls within the tube, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE C. MARSH. Witnesses HENRY XV. HART, A. J. BRIEN. 

